Bugfix: silence another which ruby call and also test for executable …

…on system ruby.

scripts/utility

@@ -313,8 +313,8 @@ __rvm_list() {
     fi
 
     system_ruby="$(rvm system ; which ruby 2>/dev/null)"
-    if [[ ! -z "$system_ruby" ]] ; then
-      system_version=$(file $(which ruby) | awk -F: '{print $2}' | grep 8 | awk '{print $NF}' | tr "\n" ' ')
+    if [[ ! -z "$system_ruby" ]] && [[ -x "$system_ruby" ]]; then
+      system_version=$(file $system_ruby | awk -F: '{print $2}' | grep 8 | awk '{print $NF}' | tr "\n" ' ')
       if [[ ! -z "$(which ruby 2>/dev/null)" ]] && [[ "$($(which ruby 2>/dev/null) -v)" = "$system_version" ]] ; then
         echo -e "=> $(tput setaf 2)system$(tput sgr0) [$system_version]\n"
       else
@@ -357,7 +357,7 @@ __rvm_update_rvm() {
   mkdir -p "$rvm_src_path"
   __rvm_pushpop "$rvm_src_path"
 
-  ruby="$(which ruby)"
+  ruby="$(which ruby 2>/dev/null)"
   system_ruby="$(rvm system ; which ruby 2>/dev/null)"
   if [[ ! -x "$ruby" ]] ; then
     if [[ ! -x "$system" ]] ; then